我最近胃口很好。

Wǒ zuìjìn wèikǒu hěn hǎo.

My appetite has been great lately.

我最近胃口不好。

Wǒ zuìjìn wèikǒu bù hǎo.

I haven’t had much of an appetite lately.

我没胃口吃东西。

Wǒ méi wèikǒu chī dōngxi.

I don’t have an appetite.